Framed for the brutal murders of his classmates by the mysterious Red Man, middle-school student Ganta Igarashii finds himself sentenced to death in the bizarre and fatal theme park/prison known as Deadman Wonderland. The inmates of this insane penitentiary fight for survival every day to provide entertainment for the masses. Ganta is determined to survive Deadman Wonderland and clear his name, but the price may be his soul...

Falsely accused and sentenced to death in Deadman Wonderland for murdering his classmates, Ganta begins to learn more about life inside the prison walls. Upon hearing that the Red Man, the strange being that killed his friends, is in the G Ward, Ganta heads there seeking answers, and revenge. Instead he finds a mysterious man who calls him Woodpecker...